JP2012099375A - Bulb type led lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulb type LED lamp capable of improving light-emitting efficiency by increasing heat radiation, raising amount of light, and enlarging light-emitting range etc.SOLUTION: The bulb type LED lamp 1 is provided with an LED unit 4 having LEDs 2 and LED substrates 3, a globe 5 with light transmission performance which covers the LED unit 4, a heat sink 6 of a bottomed cylindrical shape which radiates heat of the LED unit 4, a lighting device 7 which drive controls the LEDs 2, and a cylindrical heat radiation case 8 having a base part 8a. The heat radiation case 8 is incorporated inside by exposing a part of the heat sink 6 outside, the LED unit 4 is arranged at the bottom of the heat sink 6, the lighting device 7 is incorporated into the heat radiation case 8, a heat radiation resin (heat conduction member) 10 is arranged between the inner face of the heat radiation case 8 and the lighting device 7, thereby, heat from the lighting device 7 is transmitted to the heat radiation case 8 through the heat radiation resin 10, and the heat from the heat radiation case 8 and the heat from the LED unit 4 are radiated to the outside by the heat sink 6.

Description

  The present invention relates to a light bulb type LED lamp using an LED as a light source.

Currently, lighting lamps that can be turned on by a commercial AC power source using a fluorescent light source and a base for an incandescent bulb are commercially available. A light bulb using such a fluorescent lamp has a feature that it has a longer life than conventional incandescent light bulbs and is energy saving, and is expected to be widely used as an environmentally friendly lamp capable of reducing CO _2. It is.

  On the other hand, in recent years, a light bulb type LED lamp using an LED (light emitting diode) as a light source that has a longer life than a fluorescent lamp has appeared. Here, an example of such a bulb-type LED lamp is shown in FIG.

  FIG. 2 is a side sectional view of a conventional light bulb type LED lamp. In this light bulb type LED lamp 101, a lighting device 107 for driving an LED is incorporated in a base 111, and the lighting device 107 is a resin for insulation. Covered by a case 108. The resin case 108 is covered with a cylindrical heat sink 106 having high thermal conductivity.

  In addition, the LED unit 104 composed of the LED and the LED substrate on which the LED is mounted is installed on a disk-shaped heat sink 112 having high thermal conductivity. It is protected by a highly dome-shaped glove 105. The globe 105 is subjected to optical processing such as frost processing and lens cutting, and the distribution of light emitted from the LED is controlled by the globe 105.

  By the way, regarding the light bulb type LED lamp, Patent Document 1 discloses that an LED unit and a lighting circuit unit (lighting device) are respectively attached to a heat sink and a circuit case and thermally coupled to each other, and heat insulation is performed between the heat sink and the circuit case. A configuration for forming a gap as a layer has been proposed. According to this, when transferring the heat generated from the LED unit to the heat sink during lighting driving, the heat generated from the lighting circuit unit is hardly affected, and the heat generated in the lighting circuit unit is not easily transferred to the heat sink. Therefore, the heat generated in the LED unit is efficiently transmitted to the heat sink.

JP 2010-103241 A

  However, in the conventional light bulb type LED lamp 101 shown in FIG. 2, a heat insulating space is formed between the lighting device 107, the resin case 108, and the heat sink 106. There is a problem that is bad.

  Further, in the light bulb type LED lamp proposed in Patent Document 1, since a gap as a heat insulating layer is formed between the heat sink and the circuit case, transmission of heat generated in the lighting circuit unit to the heat sink is cut off. However, the heat conducted from the lighting circuit unit to the circuit case is radiated only from the power supply base, and thus there is a problem that heat radiation is poor.

  The present invention has been made in view of the above problems, and the object of the present invention is to provide a light bulb type LED lamp that can improve heat dissipation, improve luminous efficiency, increase the amount of light, expand the luminous range, etc. There is to do.

  To achieve the above object, the present invention provides an LED unit having an LED as a light source and an LED substrate on which the LED is mounted, a light-transmitting globe that covers the LED unit, and a bottom that dissipates heat from the LED unit. In a light bulb type LED lamp having a cylindrical heat sink, a lighting device for driving and controlling the LED, and a cylindrical heat dissipation case having a base portion connectable to a light bulb socket, a part of the heat sink is exposed to the outside. The heat dissipating case is incorporated into the heat sink, the LED unit is disposed on the bottom surface of the heat sink, the lighting device is incorporated in the heat dissipating case, and a heat conducting member is disposed between the inner surface of the heat dissipating case and the lighting device. The heat from the lighting device is transmitted to the heat radiating case through the heat conducting member, and the heat from the heat radiating case and the LED unit Characterized by being configured to heat dissipation to the outside by the heat sink.

  According to the present invention, heat generated in the LED unit is directly conducted to the heat sink and radiated from the heat sink to the outside. Further, the heat generated in the lighting device is transmitted to the heat radiating case through the heat conducting member, is transmitted from the heat radiating case to the heat sink, and is radiated to the outside from the heat sink. Therefore, since both the heat from the LED unit and the heat from the lighting device are radiated from the heat sink to the outside, the temperature rise of the LED unit and the lighting device is suppressed, and the lifetime and the light emission efficiency of the LED are improved. Moreover, as a result of improving the heat dissipation of the light bulb-type LED lamp, it is possible to expand the light emission range by lowering the installation position of the LED unit, and it is possible to increase the power consumption and realize a large amount of light.

It is a sectional side view of the bulb-type LED lamp according to the present invention. It is a sectional side view of the conventional bulb-type LED lamp.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a side sectional view of a light bulb type LED lamp according to the present invention. A light bulb type LED lamp 1 shown in FIG. 1 includes an LED unit 4 having an LED 2 as a light source and an LED substrate 3 on which the LED 2 is mounted, and the LED unit 4. A light-transmitting dome-shaped globe 5, a heat sink 6 that dissipates heat from the LED unit 4, a lighting device 7 that drives and controls the LED 2, and a base portion 8 a that can be connected to a light bulb socket (not shown). It is comprised including the thermal radiation case 8 which has.

  The heat sink 6 is integrally formed in a double cylinder shape by using aluminum, heat radiating resin, heat radiating ceramic or the like having high thermal conductivity, and the upper end portion of the bottomed cylindrical main body portion 6A incorporated in the globe 5 is It is formed in a truncated cone shape, and the LED unit 4 is installed in this portion in a state where it is joined so as to be able to transfer heat. A cylindrical heat radiation portion 6B that rises along the outer periphery of the lower portion of the globe 5 is exposed from the periphery of the lower surface opening of the main body portion 6A of the heat sink 6. In the present embodiment, the LED unit 4 is composed of a plurality of LEDs 2 and a plurality of LED substrates 3 on which these are mounted. Each of the LED 2 and the LED substrate 3 may be plural or one, and the globe 5 may be a plain lens that is not subjected to optical processing, and the globe 5 is subjected to optical processing such as frost processing and lens cutting. The light distribution of the light emitted from each LED 2 may be controlled by the globe 5. For example, the globe 5 may be a condenser lens.

  The heat dissipating case 8 is integrally formed in a cylindrical shape with heat dissipating ceramic or heat dissipating resin, and the lighting device 7 is incorporated in the center of the inside. The wire harness extending upward from the lighting device 7 passes through the heat sink 6 and is electrically connected to each LED substrate 3 of the LED unit 4.

  Thus, in the present embodiment, the space between the lighting device 7 inside the heat radiating case 8 is filled with a heat radiating resin 10 having a high heat radiating property as a heat conducting member. Instead of the heat radiating resin 10, a block-shaped heat conductive member made of aluminum having a high thermal conductivity, heat radiating ceramic, or the like may be incorporated in the heat radiating case 8. Moreover, even if the outer periphery is closely_contact | adhered to the inner periphery of the main-body part 6A of the heat sink 6, the thermal radiation case 8 may be spaced apart and the clearance gap may be formed between both.

  A metal base portion 8a is provided on the outer periphery of the lower end portion protruding downward from the heat sink 6 of the heat radiating case 8, and the light bulb type LED lamp 1 is screwed into the light bulb socket (not shown). Is attached to the light bulb socket and used for lighting.

  Thus, when a current is supplied to the light bulb type LED lamp 1 from the base portion 8a of the heat radiating case 8 in a state where the light bulb type LED lamp 1 is attached to the light bulb socket, the current is supplied from the lighting device 7 to the wire harness. 9 is supplied to each LED 2 of the LED unit 4, each LED 2 is activated and turned on, and the light distribution of the light emitted from each LED 2 is controlled by the globe 5 and used for illumination.

  By the way, although the LED unit 4 and the lighting device 7 generate heat due to the light emission of the LED 2, the heat generated in the LED unit 4 is conducted from the portion joined to the heat sink 6 so as to be able to transfer heat and is radiated from the heat sink 6 to the outside. Further, the heat generated in the lighting device 7 is transmitted to the heat radiating case 8 through the heat radiating resin 10 which is a heat conducting member, and is transmitted from the heat radiating case 8 to the heat sink 6 by radiation and heat conduction, and finally the heat sink 6. Radiates heat from the outside. In addition, since the heat dissipation amount of the heat sink 7 is sufficient, the heat generated in the lighting device 7 is sufficiently dissipated by the heat sink 6. For this reason, the heat generated in the lighting device 7 is hardly transmitted to the LED unit 4.

  Therefore, in the light bulb type LED lamp 1 according to the present embodiment, both the heat from the LED unit 4 and the heat from the lighting device 7 are radiated from the heat sink 6 to the outside, so the temperature of the LED unit 4 and the lighting device 7 is increased. The rise is suppressed, and the lifetime and luminous efficiency of the LED 2 are increased. Moreover, as a result of improving the heat dissipation of the light bulb-type LED lamp 1, the installation position of the LED unit 4 can be lowered to expand the light emission range, and the power consumption can be increased to increase the amount of light.

1 Light bulb type LED lamp 2 LED
DESCRIPTION OF SYMBOLS 3 LED board 4 LED unit 5 Globe 6 Heat sink 6A Heat sink main body 6B Heat sink heat sink 7 Lighting device 8 Heat sink case 8a Heat sink base 9 Wire harness 10 Heat dissipation resin (heat conduction member)

Claims (1)

An LED unit having an LED as a light source and an LED substrate for mounting the LED, a light-transmitting globe that covers the LED unit, a bottomed cylindrical heat sink that dissipates heat from the LED unit, and drive control of the LED In a light bulb-type LED lamp having a cylindrical heat dissipation case having a base part connectable to a lighting device and a light bulb socket,
A part of the heat sink is exposed to the outside and the heat radiating case is incorporated therein, the LED unit is disposed on the bottom surface of the heat sink, the lighting device is incorporated in the heat radiating case, and the inner surface of the heat radiating case and the A heat conducting member is disposed between the lighting devices to transmit heat from the lighting device to the heat radiating case via the heat conducting member, and heat from the heat radiating case and heat from the LED unit are radiated to the outside by the heat sink. A bulb-type LED lamp characterized by being configured as described above.

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